Certain devices, like those that need high power or fast charging, require more power — the Steam Deck is an excellent example. But there are some adapters that seem fairly close, like 5V 1A and 5V 2A, so which is the better choice for charging your devices? So, a 5V 1A charger delivers up to 5 watts (5V x 1A = 5W), versus the 5V 2A, which delivers up to 10 watts. Put in more practical terms, that means the 2A adapter would charge faster. But when comparing the two directly (5V 1A versus 5V 2A), the latter is technically better, since it supplies more power and will charge compatible devices faster.